Kareem,

The definitive text is a USGS (then dept of Commerce, later NOAA)
publication "The Principles of Interpreting Seismograms". It is
about 100 pages, and has pockets that contain large travel-time
graphs for events at various depths. I don't have the publication
details here at home. If you need them, I will get them.

About a year ago someone on the PSN net was providing copies at
cost.

Regards,
Sean-Thomas
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